If I did - if I were to use blood in one of my spells, yes.

[ Very dangerous his tone says, for once nothing but sincere. ]

Sacrificing a part of yourself like that, it's bound to attract something nasty. Especially when combined with magic. And this whole place sort of is, if you hadn't noticed. I just don't want you to end up like—

[ Maybe that's a bridge too far, in his moment of stark honesty. He falters, diverting from that train of thought at the last second. ]

...like that.